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17 package org.apache.geronimo.system.main;
18
19 import java.io.File  ;
20 import java.lang.reflect.Field ;
21 import java.net.MalformedURLException ;
22 import java.net.URL ;
23 import java.net.URLClassLoader ;
24 import java.security.AccessController ;
25 import java.security.PrivilegedAction ;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import sun.misc.URLClassPath;
30
31
34 public class ToolsJarHack {
35 private static boolean installed = false;
36 private static Log log;
37
38 public static void install() {
39 if (installed) {
40 return;
41 }
42
43 if (log == null) {
44 log = LogFactory.getLog(ToolsJarHack.class);
45 }
46
47 ClassLoader myClassLoader = ToolsJarHack.class.getClassLoader();
49 Class compilerClass = null;
50 try {
51 compilerClass = myClassLoader.loadClass("sun.tools.javac.Main");
52 } catch (ClassNotFoundException ignored) {
53 }
54 if (compilerClass != null) {
55 installed = true;
56 return;
57 }
58
59 File toolsJarFile = findToolsJarFile();
60 if (toolsJarFile == null) {
61 return;
63 }
64
65 URL toolsJarURL;
66 try {
67 toolsJarURL = toolsJarFile.toURL();
68 } catch (MalformedURLException e) {
69 log.warn("Could not all find java compiler: tools.jar file not a regular file: " + toolsJarFile.getAbsolutePath(), e);
70 return;
71 }
72 addJarToPath(toolsJarURL);
73 installed = true;
74 }
75
76 private static File findToolsJarFile() {
77 String javaHome = System.getProperty("java.home");
78 if (javaHome == null) {
79 return null;
80 }
81
82 File javaHomeDir = new File (javaHome);
83 if (!javaHomeDir.isDirectory()) {
84 return null;
85 }
86
87 File toolsJarFile = findToolsJarFile(javaHomeDir);
88 if (toolsJarFile != null) {
89 return toolsJarFile;
90 }
91
92 toolsJarFile = findToolsJarFile(javaHomeDir.getParentFile());
93 if (toolsJarFile != null) {
94 return toolsJarFile;
95 }
96
97 log.warn("Could not all find java compiler: lib" + File.separator + "tools.jar file not found in " +
98 javaHomeDir.getAbsolutePath() + " or " + javaHomeDir.getParentFile().getAbsolutePath());
99 return null;
100 }
101
102 private static File findToolsJarFile(File javaHomeDir) {
103 File toolsJarFile;
104 toolsJarFile = new File (javaHomeDir, "lib" + File.separator + "tools.jar");
105 if (!toolsJarFile.exists()) {
106 return null;
107 }
108 if (!toolsJarFile.isFile()) {
109 return null;
110 }
111 return toolsJarFile;
112 }
113
114
115 private static void addJarToPath(URL jar) {
116 URLClassLoader urlClassLoader = null;
118 try {
119 urlClassLoader = (URLClassLoader ) ClassLoader.getSystemClassLoader();
120 } catch (Throwable e) {
121 log.warn("Could not install compiler: Could not obtain access to system class loader", e);
122 return;
123 }
124
125 URLClassPath urlClassPath = getURLClassPath(urlClassLoader);
126 if (urlClassPath == null) {
127 return;
129 }
130 urlClassPath.addURL(jar);
131
132 rebuildJavaClassPathVariable(urlClassPath);
133 }
134
135 private static URLClassPath getURLClassPath(URLClassLoader loader) {
136 Field ucpField = (Field ) AccessController.doPrivileged(new PrivilegedAction () {
137 public Object run() {
138 Field ucp = null;
139 try {
140 ucp = URLClassLoader .class.getDeclaredField("ucp");
141 ucp.setAccessible(true);
142 } catch (Exception e) {
143 log.warn("Could not install compiler: Could not obtain access to ucp field of the URLClassLoader", e);
144 }
145 return ucp;
146 }
147 });
148
149 if (ucpField == null) {
150 return null;
151 }
152 try {
153 return (URLClassPath) ucpField.get(loader);
154 } catch (IllegalAccessException e) {
155 log.warn("Could not install compiler: Could not obtain access to ucp field of the URLClassLoader", e);
156 return null;
157 }
158 }
159
160 private static void rebuildJavaClassPathVariable(URLClassPath urlClassPath) {
161 URL [] urls = urlClassPath.getURLs();
162 if (urls.length < 1) {
163 return;
164 }
165
166 StringBuffer path = new StringBuffer (urls.length * 32);
167
168 for (int i = 0; i < urls.length; i++) {
169 if (i != 0) {
170 path.append(File.pathSeparator);
171 }
172
173 path.append(new File (urls[i].getFile()).getPath());
174 }
175 try {
176 System.setProperty("java.class.path", path.toString());
177 } catch (Exception e) {
178 log.warn("Error installing compiler: Could not update java.class.path property which may cause compiler to not work correctly", e);
179 }
180 }
181 }
182 |
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